Tapping Torque Tapping Torque Equation for Forming Taps Description of products Based on the tensile strength of workpiece material, we prepare following equation to obtain tapping torque of standard formig taps. Condition : Effective length of internal screw is 1.5D. Thread height is 75%. Tapping Torque Equation for Forming Taps Workpiece Materials Deforming resistance (N/mm2) General Structure Steels, Low Carbon Steels 750~850 Medium Carbon Steels, Alloy Steels 1150~1350 Stainless Steels 1100~1300 T : Tapping Torque (N-m) Wrought Aluminum 250~350 Dc : Nominal Diameter of Tap (mm) P : Pitch (mm) Aluminum Die Castings 380~530 Kf : Deforming resistance (N/mm2) Coppers, Wrought Copper Alloys 750~1050 Information Technical Technical-8 779